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Finding the Fourth Proportional to 180.91, 270.90 and 115.81

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Solution

The fourth proportional to 180.91, 270.90 and 115.81 is: 173.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.91 : 270.90 = 115.81 : x
  2. Step 2: Convert to fraction form
    180.91/270.90 = 115.81/x
  3. Step 3: Cross multiply
    180.91x = 270.90 × 115.81
  4. Step 4: Simplify right side
    180.91x = 31,372.93
  5. Step 5: Solve for x
    x = 31,372.93/180.91
  6. Step 6: Final answer
    x = 173.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.